Improvement in extractors for the teeth of coal-breakers



S. BROA'DBENT. EXTRAcToRs Fon THEVTEETH 0F coAL-,BREAKERs.

NITED STATES PATENT OFFICEc SIDNEY BROADBENT, OF SCRANTON, PENNSYLVANIA.

IMPROVEMENT IN EXTRACTORS FOR THE TEETH OF COAL-BREAKERS.

Specification forming part of Letters Patent No. 192,734, dated July 3,1877; application led May 28, 1877.

To all whom it may concern:

Be it known that I, SIDNEY BROADBENT, of Scranton, in the county ofLuzerne and State of Pennsylvania, have invented an Improvement inExtractors for the Teeth of Rolls for Goal-Grackers or Breakers, ofwhich the following is a specication: i

Inthe rollers that are used in coal-breakers the teeth are usuallyseparate from the cylinder and introduced into holes or into rings.

When the teeth become blunt and require to be sharpened, or when a toothis broken,

' the cylinder usually has to be taken out of the breaker and the teethsharpened at the machine-shop. This is expensive and causes considerabledelay. The teeth have also been placed into parallel holes in thecylinder, and when broken or worn they have been driven through into thecylinder, Abut in so doing the hole is enlarged and the egular sizedteeth will be loose when replace n the. cylinder.

My present invention relat to a mechanism for extracting the teeth whenworn or injured, so as to replace them by others.

I employ teeth that are each provided with a cylindrical shank and aneck between the portion of the tooth resting on the cylinder and thelargest part of the tooth, and 'this tooth forms the subject of aseparate application for a patent.

My present improvement relates to the means for drawing out such teeth.i

In the drawing, Figure l is a vertical section of the extractinginstrument, and of the tooth to which it is applied; and Fig. 2 is asectional plan at the line a: w of the extracting device.

The tooth is formed of a parallel body, a, and tapering point b, with acontraction or neck, c, sufficient for the extracting instrument tograsp the tooth, and the extracting `instrument is shaped to iit theshoulder of the teeth, and grasp into the neck with a .firm holdsufficient for holding` the tooth while being extracted. Y

The extracting device is made of the jaws f g, hinged together at h, andof an internal shape to t the teeth, and externally these jaws taper andreceive the sliding ring Z, that is driven down around them after thejaws are placed upon the teeth. This ring holds the jaws firmly upon thetooth, so that the tooth can be extracted by suitable power acting uponthe jaws.

To the joint h the screw m is connected, and it receives the nut n abovethe closed end o of the tube fr.

The tube r or frame serves as a resistance for the nutmas the latter isrevolved by a suitable wrench, c, to extract the tooth by drawing theinstrument and tooth bodily away from the cylinder.

This tube or frame r intervenes between the surface of the cylinder sand the nut n.'

It will be understood that the attendant examines the cylinders andextracts such teeth as may be worn out or broken, and replaces them byothers that are simply driven into place by a set that lits upon thepoint.

I claim as my invention- Y The extracting instrument for the teeth ofcoal-breaker rollers formed of the jaws f g, tapering ring l, screw m,nut n, and tube or frame r, substantially as set forth.

Signed by me this 24th day of May, A. D.

SIDNEY BROADBENT.

Witnesses:

E. W. SEERELL, J. M. C. RANGE.

